<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
            list-style: none;
        }
        textarea
        {
            width: 800px;
            margin:10px auto;
            display: block;
            resize: none;
            outline: none;
        }
        button
        {
            width: 800px;
            margin:10px auto;
            display: block;
            background: #f60;
            border:none;
            cursor:none;
            cursor: pointer;
            line-height:40px;
            color:white;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
        }
        ul
        {
            width:800px;
            margin:10px auto;
            display: block;
        }
        li
        {
            background: lightgreen;
            padding: 10px;
            margin-bottom:10px;
            position: relative; 
        }
        span
        {
            position: absolute;
            right: -5px;
            top:-5px;
            cursor:pointer
        }
    </style>
</head>
<body>
    <textarea name="" id="txt" cols="30" rows="10"></textarea>
    <button id='btn'>发布微博</button>
    <ul id='con'>
        <li>
            why so serious?
            <p>2021-06-01</p>
            <span>X</span>
        </li>
    </ul>
    <script>
        var con=document.getElementById('con')
        var txt=document.getElementById('txt')
        var btn=document.getElementById('btn')
        btn.onclick=function()
        {
            var tag = document.createElement('li');
            tag.innerHTML=`${txt.value}
            <p>2021-06-01</p>
            <span>X</span>`;
            con.appendChild(tag)
            txt.value=''
        }
        function del(a)
        {
            a.parentNode.removeChlid(a.parentNode)
        }
    </script>
</body>
</html>